Some interesting remarks from the head of MI6 (made me smile as the chap was named as Alex Younger, known as 'C' - that's his cover blown then!)
At the Munich Security Conference he said, "All experience tells us that once someone has put themselves in that sort of position, they are likely to have acquired the skills and connections that make them potentially very dangerous...public safety is the first thing we will consider."
I feel he should be listened to, as MI6 must have all the details and a vast knowledge of these things, and are more aware of the inherent dangers than uninformed 'civilians' could ever be.